IRST to Moscow
-0h 30mIRST
IRSTSOURCEMoscow
MSKGreen rows indicate typical business hours (9 AM - 5 PM)
IRST and MSK on the World Map
The map below highlights the IRST (Iran Standard Time) and MSK (Moscow Standard Time) timezone regions across the globe.
IRST – Iran Standard Time
UTC+03:30Iran Standard Time (IRST) is the time zone for Iran, 3 hours and 30 minutes ahead of UTC.
- •IRST is one of only a few time zones with a 30-minute offset.
- •Iran observes daylight saving time, switching to IRDT (UTC+04:30).
- •Tehran has a metropolitan population of over 16 million.
MSK – Moscow Standard Time
UTC+03:00Moscow Standard Time (MSK) is the time zone for Moscow and western Russia, 3 hours ahead of UTC.
- •All Russian train timetables use Moscow Time, regardless of location.
- •Russia abolished daylight saving time in 2011.
- •Moscow is the most populous city in Europe with over 12 million residents.
- •MSK shares the offset with Saudi Arabia (AST) and East Africa (EAT).
About Moscow
WikipediaMoscow operates on Moscow Standard Time (MSK), UTC+3. As Russia's capital and financial center, MSK is the reference timezone across Russia's 11 time zones.
Russia spans 11 time zones but Moscow Time (MSK) is the reference for all schedules.
Time Conversion Guide: IRST to Moscow
IRST runs on Iran Standard Time (IRST) at UTC+03:30. Moscow runs on Moscow Standard Time (MSK) at UTC+03:00. That puts IRST 30 minutes behind Moscow — a difference of -0h 30m at the current offsets.
In practice, when it is 9:00 AM in IRST it is 8:30 AM in Moscow. Midnight in IRST is 11:30 PM in Moscow. Neither zone observes daylight saving time, so the offset between them stays constant all year.
IRST to Moscow time conversion table
| IRST (IRST) | Moscow (MSK) | Day |
|---|---|---|
| 12:00 AM | 11:30 PM | previous day |
| 6:00 AM | 5:30 AM | same day |
| 7:00 AM | 6:30 AM | same day |
| 8:00 AM | 7:30 AM | same day |
| 9:00 AM | 8:30 AM | same day |
| 12:00 PM | 11:30 AM | same day |
| 3:00 PM | 2:30 PM | same day |
| 5:00 PM | 4:30 PM | same day |
| 6:00 PM | 5:30 PM | same day |
| 9:00 PM | 8:30 PM | same day |
Why people convert IRST to Moscow time
- Scheduling a call from IRST to Moscow: a 10:00 AM start in IRST lands at 9:30 AM in Moscow, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both IRST and Moscow are inside the 9-to-5 working day between 9:30 AM and 5:00 PM IRST time (9:00 AM–4:30 PM MSK). That is roughly 7 hours 30 minutes of usable overlap.
- Keeping family and friends in sync: knowing that 8:00 PM in IRST is 7:30 PM in Moscow makes it easy to avoid calling at 3 AM.
- Always state the zone abbreviation, not just the hour. "3:00 PM IRST" is unambiguous; "3 PM" across a -0h 30m gap is not.
- Block 9:30 AM–5:00 PM IRST as the recurring meeting window if you work primarily from IRST and need Moscow colleagues present.
About IRST (Iran Standard Time)
Iran Standard Time (IRST) is one of the few time zones with a 30-minute offset. Iran observes daylight saving time (IRDT, UTC+04:30) from late March to late September. Tehran, the capital, is one of the largest cities in the Middle East.
About MSK (Moscow Standard Time)
Moscow Standard Time (MSK) is the time zone used in Moscow, St. Petersburg, and much of western Russia. Russia abolished DST in 2011, so MSK is observed year-round. MSK is also the reference time for Russian railways – all train schedules in Russia are given in Moscow Time regardless of the actual local time zone.
Best time to call between IRST and Moscow
Both IRST and Moscow sit inside the 9 AM – 5 PM working day between 9:30 AM–5:00 PM IRST, which is 9:00 AM–4:30 PM MSK. That gives roughly 7 hours and 30 minutes of shared time — the safest window for a live call or meeting.
Business hours overlap
IRST and Moscow share 7 hours of working-hours overlap (9:30 AM–5:00 PM IRST), so scheduling a live meeting is straightforward.
IRST is 30 minutes behind Moscow (IRST UTC+03:30 → MSK UTC+03:00). The shared working window is 9:30 AM–5:00 PM IRST. Remember to re-check around daylight-saving transitions.
Learn More About Time
Dive deeper into the fascinating world of timekeeping, time zones, and how they shape our global society:
Frequently Asked Questions
What is the time difference between IRST and Moscow?
IRST (IRST, UTC+03:30) is 30 minutes behind Moscow (MSK, UTC+03:00). The gap is currently -0h 30m.
How do I convert IRST time to Moscow time?
Add -0h 30m to IRST local time. For example, 9:00 AM in IRST is 8:30 AM in Moscow.
What time is it in Moscow right now?
Moscow uses MSK at UTC+03:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -0h 30m offset from IRST.
What is the best time to call Moscow from IRST?
Call between 9:30 AM and 5:00 PM IRST — that maps to 9:00 AM–4:30 PM MSK and keeps both parties inside the working day.
Which is behind, IRST or Moscow?
IRST is 30 minutes behind Moscow. When it is 12:00 PM in IRST it is 11:30 AM in Moscow.
Do IRST and Moscow use different time zones?
IRST uses IRST at UTC+03:30, while Moscow (Russia) uses MSK at UTC+03:00. The IANA identifiers are Asia/Tehran and Europe/Moscow.
Does daylight saving time affect the IRST–Moscow difference?
Neither zone observes daylight saving time, so the -0h 30m offset between IRST and Moscow is fixed all year.
Which other cities share IRST's time zone?
IRST also covers Tehran, Isfahan, Mashhad, Tabriz, Shiraz, Karaj.
Which countries use IRST, IRST's zone?
IRST is used in Iran.
Is there a day difference between IRST and Moscow?
Not normally. The -0h 30m gap only pushes the date over the previous day.
What is the time difference between IRST and Moscow?
Moscow is -0h 30m from IRST.
What timezone is IRST in?
IRST operates on its local timezone.
What timezone is Moscow in?
Moscow operates on Moscow Standard Time (MSK), UTC+3. As Russia's capital and financial center, MSK is the reference timezone across Russia's 11 time zones.
What are the business hours in Moscow?
Standard business hours in Moscow are 9:00 AM - 6:00 PM MSK.
Which countries use IRST (Iran Standard Time)?
IRST is used in Iran.
Does IRST observe daylight saving time?
Yes, IRST switches to IRDT during summer months.
What are some interesting facts about IRST?
IRST is one of only a few time zones with a 30-minute offset. Iran observes daylight saving time, switching to IRDT (UTC+04:30).
Which cities are in the MSK timezone?
Major cities in the MSK timezone include Moscow, St. Petersburg, Volgograd, Nizhny Novgorod, Kazan, Samara, Rostov-on-Don.
What is the UTC offset for MSK?
Moscow Standard Time (MSK) is at UTC+03:00.
What should I know about the MSK timezone?
All Russian train timetables use Moscow Time, regardless of location. Russia abolished daylight saving time in 2011.
When is it midnight in IRST, what time is it in Moscow?
When it is 12:00 AM (midnight) in IRST (IRST), it is -0h 30m later in Moscow (MSK).
Related Developer Tools
Explore more tools that work great with timezone conversions for international teams:
Related Timezone Conversions
More IRST time conversions
- irst to tehran
- irst to iran
- irst to new york
- irst to london
- irst to dubai
- irst to tokyo
- irst to singapore
- irst to sydney
- irst to los angeles
- irst to paris
- irst to delhi
- irst to mumbai
- irst to berlin
- irst to hong kong
- irst to toronto
- irst to kathmandu
- new york to irst
- london to irst
- dubai to irst
- tokyo to irst
- singapore to irst
- sydney to irst
- los angeles to irst
- paris to irst
- delhi to irst
- mumbai to irst
- berlin to irst
- hong kong to irst
- toronto to irst
- kathmandu to irst
See every conversion from IRST →·See every conversion from Moscow →